The planetarium uses Digistar 3 software with blue, red and green lasers and grating light valve (GLV) technology to create a 4,000 pixel strip. This strip is swept to produce a 5,000 by 4,000 pixel image, refreshed 60 times per second. The image is projected through a fisheye lens onto the dome of the planetarium.[2]

This planetarium is housed inside a 45-ton bronze-clad truncated cone, with the north side tilted at 51.5o to the horizontal (the latitude of Greenwich), the south side pointing at the local Zenith (i.e. at 90 degrees to the local horizon) and the top being slanted to be parallel to the celestial equator. The construction stands parallel to (but 50 metres east of) the prime meridian.[3] It was conceived under the then Director, Roy Clare CBE, as the centrepiece of the "Time and Space" project, a £17.7m re-development of the Royal Observatory, Greenwich, and funded with a £3.25m grant from the Peter Harrison Foundation.[1][4]

1.
Planetarium
–
A planetarium is a theatre built primarily for presenting educational and entertaining shows about astronomy and the night sky, or for training in celestial navigation. Whatever technologies are used, the objective is normally to link together to provide an accurate relative motion of the sky. Typical systems can be set to display the sky at any point in time, past or present, planetaria range in size from the Hayden Planetariums 21-meter dome seating 423 people, to three-meter inflatable portable domes where children sit on the floor. Such portable planetaria serve education programs outside of the permanent installations of museums, the term planetarium is sometimes used generically to describe other devices which illustrate the solar system, such as a computer simulation or an orrery. Planetarium software refers to an application that renders a three-dimensional image of the sky onto a two-dimensional computer screen. The term planetarian is used to describe a member of the staff of a planetarium. The ancient Greek polymath Archimedes is attributed with creating a primitive device that could predict the movements of the Sun and the Moon. The discovery of the Antikythera mechanism proved that such devices already existed during antiquity, campanus of Novara described a planetary equatorium in his Theorica Planetarum, and included instructions on how to build one. The Globe of Gottorf built around 1650 had constellations painted on the inside and these devices would today usually be referred to as orreries. In fact, many planetaria today have what are called projection orreries, the small size of typical 18th century orreries limited their impact, and towards the end of that century a number of educators attempted some larger scale simulations of the heavens. The efforts of Adam Walker and his sons are noteworthy in their attempts to fuse theatrical illusions with educational aspirations, walkers Eidouranion was the heart of his public lectures or theatrical presentations. Every Planet and Satellite seems suspended in space, without any support and these devices most probably sacrificed astronomical accuracy for crowd-pleasing spectacle and sensational and awe-provoking imagery. The oldest, still working planetarium can be found in the Dutch town Franeker and it was built by Eise Eisinga in the living room of his house. It took Eisinga seven years to build his planetarium, which was completed in 1781 and this was displayed at the Deutsches Museum in 1924, construction work having been interrupted by the war. The planets travelled along overhead rails, powered by electric motors,180 stars were projected onto the wall by electric bulbs. Atwoods work at the Chicago Academy of Sciences and by the ideas of Walther Bauersfeld, in August 1923, the first Zeiss planetarium projected images of the night sky onto the white plaster lining of a 16 m hemispherical concrete dome, erected on the roof of the Zeiss works. The first official public showing was at the Deutsches Museum in Munich on October 21,1923, when Germany was divided into East and West Germany after the war, the Zeiss firm was also split. Part remained in its headquarters at Jena, in East Germany

2.
Greenwich Park
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Greenwich Park is a former hunting park in Greenwich and one of the largest single green spaces in south-east London. One of the Royal Parks of London, and the first to be enclosed, it covers 74 hectares and it commands fine views over the River Thames, the Isle of Dogs and the City of London. The park is open year round, the estate of some 200 acres was originally owned by the Abbey of St. Peter at Ghent, but reverted to the Crown in 1427 and was given by Henry VI to his uncle Humphrey, Duke of Gloucester. He built a house by the river, Bella Court, the former evolved first into the Tudor Palace of Placentia and then into the Queens House and Greenwich Hospital. Greenwich Castle, by now in disrepair, was chosen for the site of the Royal Observatory by Charles II in 1675, in the 15th century the park was mostly heathland and probably used for hawking. In the next century, deer were introduced by Henry VIII for hunting, james I enclosed the park with a brick wall, twelve feet high and two miles long at a cost of £2000, much of which remains and defines the modern boundary. In the 17th century, the park was landscaped, possibly by André Le Nôtre who is known at least to have designed plans for it, the public were first allowed into the park during the 18th century. Samuel Johnson visited the park in 1763 and commented “Is it not fine. ”, the famous hill upon which the observatory stands was used on public holidays for mass ‘tumbling’. In the 1830s a railway was driven through the middle of the lower park on a viaduct. However, the London and Greenwich Railway was later extended beneath the ground via a tunnel link between Greenwich and Maze Hill which opened in 1878. In 1888 the park got a station of its own when Greenwich Park railway station was opened, the station was not successful, with most passengers preferring the older Greenwich station, and in 1917 Greenwich Park station and the associated line closed. Greenwich Park was used for outdoor London scenes including representing the street, Constitution Hill in the 2009 film The Young Victoria starring Emily Blunt, the park is roughly rectangular in plan with sides 1000 metres by 750 metres and oriented with the long sides lying NNW to SSE. In what follows this direction is taken to be N to S for ease of exposition and it is located at grid reference TQ390772. The park is on two levels with a number of dips and gullies marking the transition between them. The lower level lies to the north, from there a walk uphill reveals the southern part - a flat expanse that is, essentially. Roughly in the centre, on the top of the hill, is the Royal Observatory, at the northern edge is the National Maritime Museum and Queens House, and beyond those Greenwich Hospital. To the east is Vanbrugh Castle, to the south is Blackheath and in the south western corner is the Rangers House, looking out over heath. To the west lie the architecturally fine streets of Chesterfield Walk, the Observatory is on the top of the hill

3.
London
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London /ˈlʌndən/ is the capital and most populous city of England and the United Kingdom. Standing on the River Thames in the south east of the island of Great Britain and it was founded by the Romans, who named it Londinium. Londons ancient core, the City of London, largely retains its 1. 12-square-mile medieval boundaries. London is a global city in the arts, commerce, education, entertainment, fashion, finance, healthcare, media, professional services, research and development, tourism. It is crowned as the worlds largest financial centre and has the fifth- or sixth-largest metropolitan area GDP in the world, London is a world cultural capital. It is the worlds most-visited city as measured by international arrivals and has the worlds largest city airport system measured by passenger traffic, London is the worlds leading investment destination, hosting more international retailers and ultra high-net-worth individuals than any other city. Londons universities form the largest concentration of education institutes in Europe. In 2012, London became the first city to have hosted the modern Summer Olympic Games three times, London has a diverse range of people and cultures, and more than 300 languages are spoken in the region. Its estimated mid-2015 municipal population was 8,673,713, the largest of any city in the European Union, Londons urban area is the second most populous in the EU, after Paris, with 9,787,426 inhabitants at the 2011 census. The citys metropolitan area is the most populous in the EU with 13,879,757 inhabitants, the city-region therefore has a similar land area and population to that of the New York metropolitan area. London was the worlds most populous city from around 1831 to 1925, Other famous landmarks include Buckingham Palace, the London Eye, Piccadilly Circus, St Pauls Cathedral, Tower Bridge, Trafalgar Square, and The Shard. The London Underground is the oldest underground railway network in the world, the etymology of London is uncertain. It is an ancient name, found in sources from the 2nd century and it is recorded c.121 as Londinium, which points to Romano-British origin, and hand-written Roman tablets recovered in the city originating from AD 65/70-80 include the word Londinio. The earliest attempted explanation, now disregarded, is attributed to Geoffrey of Monmouth in Historia Regum Britanniae and this had it that the name originated from a supposed King Lud, who had allegedly taken over the city and named it Kaerlud. From 1898, it was accepted that the name was of Celtic origin and meant place belonging to a man called *Londinos. The ultimate difficulty lies in reconciling the Latin form Londinium with the modern Welsh Llundain, which should demand a form *lōndinion, from earlier *loundiniom. The possibility cannot be ruled out that the Welsh name was borrowed back in from English at a later date, and thus cannot be used as a basis from which to reconstruct the original name. Until 1889, the name London officially applied only to the City of London, two recent discoveries indicate probable very early settlements near the Thames in the London area

4.
National Maritime Museum
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The National Maritime Museum in Greenwich, London, is the leading maritime museum of the United Kingdom and may be the largest museum of its kind in the world. The historic buildings form part of the Maritime Greenwich World Heritage Site, the museum is a non-departmental public body sponsored by the Department for Culture, Media and Sport. Like other publicly funded museums in the United Kingdom, the National Maritime Museum does not levy an admission charge. The Museum was created by the National Maritime Act of 1934 Chapter 43, under a Board of Trustees and it is based on the generous donations of Sir James Caird. King George VI formally opened the Museum on 27 April 1937 when his daughter Princess Elizabeth, the first Director was Sir Geoffrey Callender. Since earliest times Greenwich has had associations with the sea and navigation and it was a landing place for the Romans, Henry VIII lived here, the navy has roots on the waterfront, and Charles II founded the Royal Observatory in 1675 for finding the longitude of places. An active loans programme ensures that items from the collection are seen in the UK, through its displays, exhibitions and outreach programmes the Museum also explores our current relationship with the sea and the future of the sea as an environmental force and resource. The museum plays host to exhibitions, including Ships Clocks & Stars in 2014, Samuel Pepys, Plague, Fire, Revolution in 2015 and Emma Hamilton, Seduction. The collection of the National Maritime Museum also includes items taken from the German Naval Academy Mürwik after World War II, including several ship models, the museum has been criticized for possessing what has been described as Looted art. The Museum regards these cultural objects as war trophies, removed under the provisions of the Potsdam Conference, the Museum awards the Caird Medal annually in honour of its major donor, Sir James Caird. The Caird Library is a comprehensive specialist reference library and a research resource for all. The reading room is open Monday to Friday,10. 00–16.45, the Archive and Library holds a fantastic range of resources for finding out more about maritime history. Material includes manuscripts, books, charts and maps dating back to the 15th century, the collection can be used to research maritime history and exploration, the history of the Merchant Navy and the Royal Navy and much more, including astronomy and timekeeping. Many of the resources they hold are useful for family historians, including collections of Master’s Certificates dating back to 1845. For news and interesting items from the collection, see Caird Library blog To request items to view in the Library, search Archive catalogue and Library catalogue. The Library has produced a range of guides to help people carry out their own research on a wide range of topics. The guides provide information about the Museums collections and other sources for research into maritime history, find out more about the research guides at Research Guides. The museum was established in 1934 within the 200 acres of Greenwich Royal Park in the buildings formerly occupied by the Royal Hospital School

5.
Fisheye lens
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A fisheye lens is an ultra wide-angle lens that produces strong visual distortion intended to create a wide panoramic or hemispherical image. The term fisheye was coined in 1906 by American physicist and inventor Robert W. Wood based on how a fish would see an ultrawide hemispherical view from beneath the water. Their first practical use was in the 1920s for use in meteorology to study cloud formation giving them the name whole-sky lenses, the angle of view of a fisheye lens is usually between 100 and 180 degrees while the focal lengths depend on the film format they are designed for. Mass-produced fisheye lenses for photography first appeared in the early 1960s and are used for their unique. For the popular 35 mm film format, typical lengths of fisheye lenses are between 8 mm and 10 mm for circular images, and 15–16 mm for full-frame images. For digital cameras using smaller electronic imagers such as 6.4 mm and 8.5 mm format CCD or CMOS sensors, the focal length of miniature fisheye lenses can be as short as 1 to 2 mm. These types of lenses also have other applications such as re-projecting images filmed through a lens, or created via computer generated graphics. Fisheye lenses are used for scientific photography such as recording of aurora and meteors. They are also used as peephole door viewers to give the user a wide field of view. In a circular lens, the image circle is inscribed in the film or sensor area. Further, different fisheye lenses distort images differently, and the manner of distortion is referred to as their mapping function, a common type for consumer use is equisolid angle. Although there are digital fisheye effects available both in-camera and as computer software they cant extend the angle of view of the images to the very large one of a true fisheye lens. The first types of lenses to be developed were circular fisheye — lenses which took in a 180° hemisphere. Some circular fisheyes were available in orthographic projection models for scientific applications and these have a 180° vertical angle of view, and the horizontal and diagonal angle of view are also 180°. Most circular fisheye lenses cover a smaller circle than rectilinear lenses. The first full-frame fisheye lens to be mass-produced was a 16 mm lens made by Nikon in the early 1970s, Digital cameras with APS-C sized sensors require a 10.5 mm lens to get the same effect as a 16 mm lens on a camera with full-frame sensor. Sigma currently makes a 4. 5mm fisheye lens that captures a 180-degree field of view on a crop body, sunex also makes a 5. 6mm fisheye lens that captures a circular 185-degree field of view on a 1. 5x Nikon and 1. 6x Canon DSLR cameras. Nikon produced a 6 mm circular fisheye lens that was designed for an expedition to Antarctica

6.
Prime meridian
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A prime meridian is a meridian in a geographical coordinate system at which longitude is defined to be 0°. Together, a meridian and its antimeridian form a great circle. This great circle divides the sphere, e. g. the Earth, if one uses directions of East and West from a defined prime meridian, then they can be called Eastern Hemisphere and Western Hemisphere. The most widely used modern meridian is the IERS Reference Meridian and it is derived but deviates slightly from the Greenwich Meridian, which was selected as an international standard in 1884. The notion of longitude was developed by the Greek Eratosthenes in Alexandria, and Hipparchus in Rhodes, but it was Ptolemy who first used a consistent meridian for a world map in his Geographia. The main point is to be comfortably west of the tip of Africa as negative numbers were not yet in use. His prime meridian corresponds to 18°40 west of Winchester today, at that time the chief method of determining longitude was by using the reported times of lunar eclipses in different countries. Ptolemys Geographia was first printed with maps at Bologna in 1477, but there was still a hope that a natural basis for a prime meridian existed. The Tordesillas line was settled at 370 leagues west of Cape Verde. This is shown in Diogo Ribeiros 1529 map, in 1541, Mercator produced his famous 41 cm terrestrial globe and drew his prime meridian precisely through Fuertaventura in the Canaries. His later maps used the Azores, following the magnetic hypothesis, but by the time that Ortelius produced the first modern atlas in 1570, other islands such as Cape Verde were coming into use. In his atlas longitudes were counted from 0° to 360°, not 180°W to 180°E as is usual today and this practice was followed by navigators well into the 18th century. In 1634, Cardinal Richelieu used the westernmost island of the Canaries, Ferro, 19°55 west of Paris, the geographer Delisle decided to round this off to 20°, so that it simply became the meridian of Paris disguised. In the early 18th century the battle was on to improve the determination of longitude at sea, between 1765 and 1811, Nevil Maskelyne published 49 issues of the Nautical Almanac based on the meridian of the Royal Observatory, Greenwich. Maskelynes tables not only made the lunar method practicable, they made the Greenwich meridian the universal reference point. In 1884, at the International Meridian Conference in Washington, D. C.22 countries voted to adopt the Greenwich meridian as the meridian of the world. The French argued for a line, mentioning the Azores and the Bering Strait. In October 1884 the Greenwich Meridian was selected by delegates to the International Meridian Conference held in Washington, united States to be the common zero of longitude and standard of time reckoning throughout the world

7.
Royal Observatory, Greenwich
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The Royal Observatory, Greenwich is an observatory situated on a hill in Greenwich Park, overlooking the River Thames. It played a role in the history of astronomy and navigation. The observatory was commissioned in 1675 by King Charles II, with the stone being laid on 10 August. The site was chosen by Sir Christopher Wren and he appointed John Flamsteed as the first Astronomer Royal. The building was completed in the summer of 1676, the building was often called Flamsteed House, in reference to its first occupant. The scientific work of the observatory was relocated elsewhere in stages in the first half of the 20th century,1675 –22 June, Royal Observatory founded. 1675 –10 August, construction began,1714 Longitude Act established the Board of Longitude and Longitude rewards. The Astronomer Royal was, until the Board was dissolved in 1828,1767 Astronomer Royal Nevil Maskelyne began publication of the Nautical Almanac, based on observations made at the Observatory. 1833 Daily time signals began, marked by dropping a Time ball,1899 The New Physical Observatory was completed. 1924 Hourly time signals from the Royal Observatory were first broadcast on 5 February,1948 Office of the Astronomer Royal was moved to Herstmonceux. 1957 Royal Observatory completed its move to Herstmonceux, becoming the Royal Greenwich Observatory, the Greenwich site is renamed the Old Royal Observatory. Greenwich site is returned to its name, the Royal Observatory. The Ordnance Office was given responsibility for building the Observatory, with Moore providing the key instruments, Moore donated two clocks, built by Thomas Tompion, which were installed in the 20 foot high Octagon Room, the principal room of the building. They were of unusual design, each with a pendulum 13 feet in length mounted above the face, giving a period of four seconds. British astronomers have used the Royal Observatory as a basis for measurement. Four separate meridians have passed through the buildings, defined by successive instruments, subsequently, nations across the world used it as their standard for mapping and timekeeping. When the Airy circle became the reference for the meridian, the difference resulting from the change was considered enough to be neglected. When a new triangulation was done between 1936 and 1962, scientists determined that in the Ordnance Survey system the longitude of the international Greenwich meridian was not 0° and this old astronomical prime meridian has been replaced by a more precise prime meridian

8.
London Planetarium
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The building known as the London Planetarium is in Marylebone Road, London. It is adjacent to Madame Tussauds and is owned by the same company, a famous London landmark, it was once a notable tourist attraction, housing a planetarium, which offered shows relating to space and astronomy. It closed in 2006 as an attraction and is now part of Madame Tussauds. From 2010 forward, the building once housed the London Planetarium houses the Marvel Superheroes 4D attraction. The only planetarium in London is now the Peter Harrison Planetarium in Greenwich, for its first five decades of operation, an opto-mechanical star projector offered the audience a show based on a view of the night sky as seen from earth. Between 1977 and 1990, evening laser performances called Laserium were held, in 1986 the planetarium was mentioned in the song Dickie Davies Eyes by Half Man Half Biscuit, which claimed that Brian Moores head looks uncannily like London Planetarium. Madame Tussauds subsequently announced that in July 2006 the Auditorium would open with a show by Aardman Animations about celebrities, to say farewell to the planetarium, Madame Tussauds allowed free entry to the show in its penultimate, week. Dr Henry C. King opened the planetarium and served as Scientific Director before opening and curating the McLaughlin planetarium in Toronto, john Ebdon, author, broadcaster and Graecophile was director of the London Planetarium. The London Planetarium no longer exists and it is no longer possible to visit it as a separate attraction, the web site is redirected to Madame Tussauds and here is a statement from their web site, In 2006 the Planetarium was rebranded and renamed the Star Dome. The Star Dome is part of the Madame Tussauds attraction and is included in the ticket price, please note that we no longer show astronomy-based shows From 2010 forward, the building that once housed the London Planetarium houses the Marvel Superheroes 4D attraction

9.
Wayback Machine
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The Internet Archive launched the Wayback Machine in October 2001. It was set up by Brewster Kahle and Bruce Gilliat, and is maintained with content from Alexa Internet, the service enables users to see archived versions of web pages across time, which the archive calls a three dimensional index. Since 1996, the Wayback Machine has been archiving cached pages of websites onto its large cluster of Linux nodes and it revisits sites every few weeks or months and archives a new version. Sites can also be captured on the fly by visitors who enter the sites URL into a search box, the intent is to capture and archive content that otherwise would be lost whenever a site is changed or closed down. The overall vision of the machines creators is to archive the entire Internet, the name Wayback Machine was chosen as a reference to the WABAC machine, a time-traveling device used by the characters Mr. Peabody and Sherman in The Rocky and Bullwinkle Show, an animated cartoon. These crawlers also respect the robots exclusion standard for websites whose owners opt for them not to appear in search results or be cached, to overcome inconsistencies in partially cached websites, Archive-It. Information had been kept on digital tape for five years, with Kahle occasionally allowing researchers, when the archive reached its fifth anniversary, it was unveiled and opened to the public in a ceremony at the University of California, Berkeley. Snapshots usually become more than six months after they are archived or, in some cases, even later. The frequency of snapshots is variable, so not all tracked website updates are recorded, Sometimes there are intervals of several weeks or years between snapshots. After August 2008 sites had to be listed on the Open Directory in order to be included. As of 2009, the Wayback Machine contained approximately three petabytes of data and was growing at a rate of 100 terabytes each month, the growth rate reported in 2003 was 12 terabytes/month, the data is stored on PetaBox rack systems manufactured by Capricorn Technologies. In 2009, the Internet Archive migrated its customized storage architecture to Sun Open Storage, in 2011 a new, improved version of the Wayback Machine, with an updated interface and fresher index of archived content, was made available for public testing. The index driving the classic Wayback Machine only has a bit of material past 2008. In January 2013, the company announced a ground-breaking milestone of 240 billion URLs, in October 2013, the company announced the Save a Page feature which allows any Internet user to archive the contents of a URL. This became a threat of abuse by the service for hosting malicious binaries, as of December 2014, the Wayback Machine contained almost nine petabytes of data and was growing at a rate of about 20 terabytes each week. Between October 2013 and March 2015 the websites global Alexa rank changed from 162 to 208, in a 2009 case, Netbula, LLC v. Chordiant Software Inc. defendant Chordiant filed a motion to compel Netbula to disable the robots. Netbula objected to the motion on the ground that defendants were asking to alter Netbulas website, in an October 2004 case, Telewizja Polska USA, Inc. v. Echostar Satellite, No.02 C3293,65 Fed. 673, a litigant attempted to use the Wayback Machine archives as a source of admissible evidence, Telewizja Polska is the provider of TVP Polonia and EchoStar operates the Dish Network

10.
Geographic coordinate system
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A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a two-dimensional map requires a map projection. The invention of a coordinate system is generally credited to Eratosthenes of Cyrene. Ptolemy credited him with the adoption of longitude and latitude. Ptolemys 2nd-century Geography used the prime meridian but measured latitude from the equator instead. Mathematical cartography resumed in Europe following Maximus Planudes recovery of Ptolemys text a little before 1300, in 1884, the United States hosted the International Meridian Conference, attended by representatives from twenty-five nations. Twenty-two of them agreed to adopt the longitude of the Royal Observatory in Greenwich, the Dominican Republic voted against the motion, while France and Brazil abstained. France adopted Greenwich Mean Time in place of local determinations by the Paris Observatory in 1911, the latitude of a point on Earths surface is the angle between the equatorial plane and the straight line that passes through that point and through the center of the Earth. Lines joining points of the same latitude trace circles on the surface of Earth called parallels, as they are parallel to the equator, the north pole is 90° N, the south pole is 90° S. The 0° parallel of latitude is designated the equator, the plane of all geographic coordinate systems. The equator divides the globe into Northern and Southern Hemispheres, the longitude of a point on Earths surface is the angle east or west of a reference meridian to another meridian that passes through that point. All meridians are halves of great ellipses, which converge at the north and south poles, the prime meridian determines the proper Eastern and Western Hemispheres, although maps often divide these hemispheres further west in order to keep the Old World on a single side. The antipodal meridian of Greenwich is both 180°W and 180°E, the combination of these two components specifies the position of any location on the surface of Earth, without consideration of altitude or depth. The grid formed by lines of latitude and longitude is known as a graticule, the origin/zero point of this system is located in the Gulf of Guinea about 625 km south of Tema, Ghana. To completely specify a location of a feature on, in, or above Earth. Earth is not a sphere, but a shape approximating a biaxial ellipsoid. It is nearly spherical, but has an equatorial bulge making the radius at the equator about 0. 3% larger than the radius measured through the poles, the shorter axis approximately coincides with the axis of rotation

Planetarium
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A planetarium is a theatre built primarily for presenting educational and entertaining shows about astronomy and the night sky, or for training in celestial navigation. Whatever technologies are used, the objective is normally to link together to provide an accurate relative motion of the sky. Typical systems can be set to display the sky at any po

2.
Inside the same hall during projection. (Belgrade Planetarium, Serbia)

3.
A planetarium under construction in Nishapur, near the Mausoleum of Omar Khayyam.

4.
The Eise Eisinga Planetarium

Greenwich Park
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Greenwich Park is a former hunting park in Greenwich and one of the largest single green spaces in south-east London. One of the Royal Parks of London, and the first to be enclosed, it covers 74 hectares and it commands fine views over the River Thames, the Isle of Dogs and the City of London. The park is open year round, the estate of some 200 acr

1.
View of Queens House and Canary Wharf from Greenwich Park

2.
London from Greenwich Park, in 1809, by William Turner

3.
Greenwich Park

4.
The Royal Observatory

London
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London /ˈlʌndən/ is the capital and most populous city of England and the United Kingdom. Standing on the River Thames in the south east of the island of Great Britain and it was founded by the Romans, who named it Londinium. Londons ancient core, the City of London, largely retains its 1. 12-square-mile medieval boundaries. London is a global city

1.
Palace of Westminster, Buckingham Palace and Central London skyline

4.
The name London may derive from the River Thames

National Maritime Museum
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The National Maritime Museum in Greenwich, London, is the leading maritime museum of the United Kingdom and may be the largest museum of its kind in the world. The historic buildings form part of the Maritime Greenwich World Heritage Site, the museum is a non-departmental public body sponsored by the Department for Culture, Media and Sport. Like ot

1.
National Maritime Museum

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Portrait of Captain James Cook by Nathaniel Dance at the National Maritime Museum.

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The Bretagne, painting by Jules Achille Noël, 1859, at the National Maritime Museum

Fisheye lens
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A fisheye lens is an ultra wide-angle lens that produces strong visual distortion intended to create a wide panoramic or hemispherical image. The term fisheye was coined in 1906 by American physicist and inventor Robert W. Wood based on how a fish would see an ultrawide hemispherical view from beneath the water. Their first practical use was in the

1.
A fisheye lens on a Nikon 1 V1

2.
ESO 's VLT image taken with a circular fisheye lens.

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An example of full-frame fisheye used in a closed space (Nikkor 10.5mm)

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An image of the Louvre museum entry taken with the 7.5 mm f /5.6 circular fisheye Nikkor lens

Prime meridian
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A prime meridian is a meridian in a geographical coordinate system at which longitude is defined to be 0°. Together, a meridian and its antimeridian form a great circle. This great circle divides the sphere, e. g. the Earth, if one uses directions of East and West from a defined prime meridian, then they can be called Eastern Hemisphere and Western

1.
Gerardus Mercator in his Atlas Cosmographicae (1595) uses a prime meridian somewhere close to 25°W, passing just to the west of Santa Maria Island in the Atlantic. His 180th meridian runs along the Strait of Anián (Bering Strait)

2.
Ptolemy's 1st projection, redrawn under Maximus Planudes around 1300, using a prime meridian west of Africa

3.
Diogo Ribeiro's map of 1529, now in the Vatican library

Royal Observatory, Greenwich
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The Royal Observatory, Greenwich is an observatory situated on a hill in Greenwich Park, overlooking the River Thames. It played a role in the history of astronomy and navigation. The observatory was commissioned in 1675 by King Charles II, with the stone being laid on 10 August. The site was chosen by Sir Christopher Wren and he appointed John Fla

1.
Royal Observatory, Greenwich. A time ball sits atop the Octagon Room.

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Flamsteed House in 1824

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Royal Observatory, Greenwich c. 1902 as depicted on a postcard

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Former Royal Greenwich Observatory, Herstmonceux, East Sussex

London Planetarium
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The building known as the London Planetarium is in Marylebone Road, London. It is adjacent to Madame Tussauds and is owned by the same company, a famous London landmark, it was once a notable tourist attraction, housing a planetarium, which offered shows relating to space and astronomy. It closed in 2006 as an attraction and is now part of Madame T

1.
The former Planetarium, showing Tussaud's branding

2.
The Planetarium in 2006

Wayback Machine
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The Internet Archive launched the Wayback Machine in October 2001. It was set up by Brewster Kahle and Bruce Gilliat, and is maintained with content from Alexa Internet, the service enables users to see archived versions of web pages across time, which the archive calls a three dimensional index. Since 1996, the Wayback Machine has been archiving c

1.
Wayback Machine

Geographic coordinate system
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A geographic coordinate system is a coordinate system used in geography that enables every location on Earth to be specified by a set of numbers, letters or symbols. The coordinates are chosen such that one of the numbers represents a vertical position. A common choice of coordinates is latitude, longitude and elevation, to specify a location on a

1.
Longitude lines are perpendicular and latitude lines are parallel to the equator.